Year	metric tons
1961	1142799
1962	2238756
1963	2033301
1964	1791141
1965	1788800
1966	788948
1967	1691715
1968	1167475
1969	1664463
1970	884104
1971	1138861
1972	2563189
1973	725842
1974	2323962
1975	2196641
1976	2919131
1977	1639217
1978	2456051
1979	1763198
1980	3884236
1981	3559272
1982	2283042
1983	2695630
1984	1444371
1985	2542958
1986	3166999
1987	2300477
1988	5001600
1989	1404498
1990	3100767
1991	3288640
1992	4360612
1993	5387053
1994	5393352.46
1995	6095329
1996	5991428
1997	4322580
1998	5271967
1999	3301339
2000	3512791
2001	5161232
2002	5932429
2003	6227315
2004	5281248
2005	5631256
2006	6302288
2007	5010856
2008	2684688
2009	4738674
2010	3900866
2011	4826260
2012	4597674
2013	4205161
2014	2694207.88
2015	4383804
2016	2661613
2017	2934757.33
2018	1733917.83
2019	6356135.92
2020	5322400.4
2021	2514776.43
2022	2276238